Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '120b0b652d9a5e3f7e813f6dd7f117c984430fa5f9d51c978643bdc90d080e2d' 
  AND token = 'ZgRcb0wWccupqH+QOqN0Cs3gfNmuLBiPMjdpZ+fp9x4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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