Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96ce3121063b7064436cf4735f0d61f14fb4c2415868ee4395ffcc2d54e1cf4f' 
  AND token = '/SRknf6272dDucrc+37fBXiD0k1/wgvJX6BFTCdVb7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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