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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '843876b11374e3cd5110dacca16a936c02a2ffc9e2ea143867d62473c626814f' 
  AND token = 'Wb83KHtBmvybXc0btjfKdd5HvBtMN2doFJfx9CUrebE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}