Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e8fe1fc915e07854ec29efa7ca40625d378f5a39147475170d4f24ade754469' 
  AND token = '6M3q1Blg8ZANxNHybJ7v+5idcqVWbf18FzMfyN7GDFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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