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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '666cb1a01b8895fd961095a91bbcb42bd09ac035c231d3490aea92c656c789ed' 
  AND token = 'D0lVo6bI5GECerdVJ4YMK87fdUhqXzqfzZtcaGXy4nM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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