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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a3517b25bdb203f1593c921c60497bb6c3f856ce6d73d1345a3a6dc36774730a' 
  AND token = 'of4SdZTEo91Hzn6+uSNTJZnHBwr7UZ/xTqfffTtD+L8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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