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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bc83cd302dbfb0d7b4061e49f9af6e2c7395ccec03c643f82f0366ab04ddb882' 
  AND token = 'VNjmHR4H+3YG983bNHtAHLAbNdsRT4CjHeeC8G2UlBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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