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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ca5ca2c32312b7e4ec74fcdc8b1e5c2926572563672ea1207579cfc05aabf076' 
  AND token = 'qRkC3Nj6skBb+NGsD2AsPT1TScRSeKcRnP0Rgdqbq0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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