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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e37752c026aad7588672ae68003f7bc71ffb05055c3c8bc863ba2ce3545e61c6' 
  AND token = 'cazvg9k2N0eWOYJ/wwCxK9QWlE/36aTGaCr8Z3ezrTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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