SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f9e95b061f512e60e44a1811ca9f1f680a099c338d70e2f5afcd6272f15a8bb5' 
  AND token = 'VodCAhCQje9yLntgLPNC74FYXIGKOfj72W4PmpUS5TY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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