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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '854bb345f184b87cbe58b66c81150ea174fbfaec5a85f73f5ac68da7a3f113f8' 
  AND token = 'kgSshyj7agQYtJVd1jyWyZYMXUxHxCz39v/p8YQnsLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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