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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'b5b06de480f91a94c7a5380791a92a6e2d633585cd9b868019dfedef36e4ac97' 
  AND token = 'qAFSzBq8Aav8fGa4x1kkxppNagSHKt+MHzgjvP5mTks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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