Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc9cb4f58002beb78e62836451291c6ed52704292de1139385648b5b944a67f2' 
  AND token = 'i7Bjlncyfd2c0jl2T+9hO+idufaBbPvnrS+DxsduJZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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