Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7eb732f9f4437a9dc4e1dd6092e27fdaa761781fe3a6c932e7b8976fd8bfa36' 
  AND token = 'saYxrQGKttx/o8pa3fYV/rnai7JWw0NdNjlLnJnyS/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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