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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c0cda8db4c8cbce1265bc93824b219dbcbcfdffbcd589209eafad00f7a81b4a0' 
  AND token = 'FkPcyKlUv7u5mC71fF9D28O/Dio0ZPH3T2JowfV9/Qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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