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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2f3949ad9e3583f4a8594a955c58ad19c2cee8ffc481060c80a89c3ee258461f' 
  AND token = 'axCqCO7BKBfOYJa53A0bACocS7cswKt75NfV7LE6AOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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