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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '17d7139063b413ee829482e9965b65601f3715e0d39a37381b8705214184082b' 
  AND token = 'nSCkP6EDbw1crWk3zl/OTbOYB/rq2i/N6wcAn1HdtjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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