Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5110fd75757e21715d5c129835dc173851ffbb09b80fae7da780defa68cb49b2' 
  AND token = 'LH3YfK/WHAXn1i0PeZD2NvKhx+SmCJbUN/N22FDj7tI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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