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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9a2971d6d16f240134d4db584d3fed27e99b7fcabb0388ac9abce4175905a5f4' 
  AND token = 'b0boK9ZndLapyEZ1Moe+mNkV3ZUSAAF8zvcSqULCzfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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