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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1aa6be43cef2ae39335db25d36e7297cddbb960e6fadd1ac9aa080303c7bbd0b' 
  AND token = 'uZ342f/rHsmQUeY3IuQVNDPzDv2D4Xqj00SK+66DnoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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