Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '616d953f0a7fbb16adf28a8c88b4177625587fba75a90ed072a024845d94e152' 
  AND token = 'eLrpwdPHJw2DHedUSw0txDau4VqxIKw+AwgpjaeCMXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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