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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '791555401a8ff46e2374fe6e80efa96de310e37c80454d9e8165c4a30faefd27' 
  AND token = 'zC7i5/TCETAo2+VURmxCZ21S2Ep4wzRYwevL8qonfAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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