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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1a542ce41b651d7f9e9a61340ced0cd9d23a41a0c34f9de280b580bd48fc0303' 
  AND token = 'n/6DFaFhlyePQ7k7TdBt1OjVbzKjAfJveonbnQpr1+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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