Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '458d46aad35d44d331105909f42b0a5a3a97f09bf591d921021c36f88107d107' 
  AND token = 'RPQhIk4l5YOYRpKntLsJdJF50+z3Qj8aCPZSODAlyBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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