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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '08308efe1498d6561d341e09ae810d280aa6cdeeef40fbff83a0e6ffd41fdbe9' 
  AND token = 'OUIykulPH4x58YXBBTsYPkEwf5WRfSc2bTCWRPAkE5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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