Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a90b910d987dbec3be2b07d6c937940fc130e44f556d94a3f90cf0bad77a7df2' 
  AND token = 'z9UqgNhqbkJarbp73tI8tHIIqDBJUdJk+g86mZUgS2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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