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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1cdaa8b2bd434f98a70cdf562dc304afbaa8ac6e660c997525b4d695e161dda5' 
  AND token = 'FrHkEbQq7qomkoGeNya6KUNhAOSSpJOmotRFDqKj6WY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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