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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f0bfae641035fe73b9a9c3303a9948e85a0f25c4d588794487d998aa7b2b2d61' 
  AND token = 'zNjvlduxNdZNOp8denfKF4MAtyEeNJKHzyMzNLBwijA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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