Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb473944b99dedd771f2cf57dda0dfbb19c5aa1e8d039721f014969073ac1001' 
  AND token = 'AdapvxHpIgqs6Fm2QlxtD9hQqwAVIEiaMy/VWLzxymE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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