Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1a65f22936d3e7cfd9f0d3142a3178c83f242dccc483df343c37ee4a5def38d' 
  AND token = 'RlYXG1su4q4K/JTGYw5HRWhZqGBBPbICdTxd/nsnais=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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