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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ccb1aabaefbf25ae0fa0642dfe72f3fafae7b4ed8f9734fe34b4542b1613e0f5' 
  AND token = 'pJkEcqM9+jU2/tgvJuax4ZL7qIqWrG6HOgcNGW2asGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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