Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ff709d8fe2cf3c8eb62b7ad4efd8834b0b490154ecbfb3109e74ffe08d702e5' 
  AND token = 'B/MWsZ0PKXwQXRMN262TnLl9ODcfFRvHbHlrmp2gtUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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