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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'eb88882652f0fd65cdb2af28dc45e0dfd7ee6c233e5cbeefacdb12df61fba373' 
  AND token = 'Q5XV0+/H5a+slbSq8kD9Jg1uyWYN0sc2WSrZbDVeMzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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