Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50d18dac3455e4e7f69bc44e2e522e8c4bf02b4bb56b5f608ed43fecd6875baf' 
  AND token = '/wcZyvURPCsVV1vG7Djz6HGLsaMEy032Eg8UVXIEMAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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