Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a3b9e488ee595d67079240cfdb4e52277769fec050d4bcefc32933dced582ca' 
  AND token = 'Qh9aCnqy/jUoNxXZ+Xt5AxUS3zr4pzMzmRrFgcD3ry0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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