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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'fc24efc614394230f5248b9616aa28b92150c03a5b21a97b49a3f5795318f5b9' 
  AND token = 'm1lIXZr5U/PhfrOrrqhf7fPphpDgOm5pDGXWARAcxSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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