Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9bc7e345deeef7fa875469feddbbd5c138d36b9439f5a620c7aaaeb071ad78d' 
  AND token = 'q7BfJuKka6xA4y/V2X/0fPu2LZMcN3mWhkJmqf1dHgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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