Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab8a9117e3221509f44c6fa3f35ec38e4b1c345e0f0e861f4c03ed62b6c3d1d5' 
  AND token = 'Of7HCPBUpb2Yt6pGxbNy5T2gDRat5ezsRZ6vzMkPRaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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