Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '510e2fcf25213b0bc0cc86522268d906e3ea6157d0a03dfdc5eea3779bb37159' 
  AND token = '1X2U0IDSx3p9po7dAiQOB2+1T6UgAJy1avEFf6ZRnI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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