Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8439fb1a7bef6db15b57e78c1ae4263a829b4146700f34e4a490d3f760cea19b' 
  AND token = '+FejPAT/fbTcN4FvUs3IIHrn4SIt1cFLmzmQR2mDH6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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