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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'faf9a268d7d45167aeff0e01ef797e73280376d8a11963485d7faf3aedfafe3a' 
  AND token = 'eJ6aGlxYMBNHnCeQhdDuO0TUzlVjmEP10dFUGtMZWI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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