Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3879adc8a45b078ee2cd98a22c601957aa6ca09a6cd93b3b9257d03eac49610f' 
  AND token = 'i+Ro1li/1u/Telgvh+Fj0a6nlx8120JMhpDR2bpJARw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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