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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '99d9a533790ac2999d5455ec85ccb6081527676a49f8483af3a83d428473b559' 
  AND token = 'ioxyXcgd1F0i9il2rQ0hXk9ShBuhgqZ8WKAA74yFcZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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