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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5cca31e12bc54b97ea651aa8cdbd73f9a850c6744eeca9db6efa03090fb351c2' 
  AND token = 'xNLNy39oOEEgQfuuo80GJoLJs30Za9+HOh0MQY14NGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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