Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7fac988ffec42eb2659d8bf72cc1d819da5eb05a907b5261f33c900ca6045a6' 
  AND token = '3mKdadIuv9X9HOjy+6Yfuq2RXIbfSXfhH5VMVBJtk08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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