Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9ed8beb6bcb57522bbbf3dd7804dc141712ed5bfcc1208b4ad3101138c9980f' 
  AND token = 'Mfu3o7euOGm2HrBLb2EdjmrER69sq2gEwa+9aTYd//4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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