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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e04495cc0575fec6fffb01d2b47e7ab35c1d1be8c16da991eec96bd26f6228eb' 
  AND token = 'mnjjiQq8OUHAeK2+RgjL+45BMxI5MaU0FAoCjmaFIIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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