Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a5d36752252b578144095f4fe106b9820ebcf0b2e85b9a1c3be39805e38c69c' 
  AND token = '31xweDJKB6ktTWB/DIhsH3A6FZazwTfmQ2lRhbW0aB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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