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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '7150d3e112f04a195b6e8741d8019e29b72cc8a0c26bf8595037accd6e05e2ed' 
  AND token = 'zE28J3UuufnECjpzMyxsfL4BoS7Dz7ybUyY3vM7391g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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