SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f103fd482f9f801195b906ed7cb418be52d65612ea5b0ccc626764df95863ed7' 
  AND token = 'bb9Pt+zZNKKTyIBVH41pqi8686A4D0KqNzJUFowbp68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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