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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2cc27bee0b8c283ebdaa45d27a27b47560e95eb6fb99c6e0e540ddc82c3220c3' 
  AND token = 'TeEbB1UHHqQPZ3gz0t6U++h3qai2U7qV9EncWp6jlqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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