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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1ddb028848bd67e1f6295019045e26fda004133f54d6a0553f3cc33a3827ae62' 
  AND token = 'SfDa/EkDATMOra1p2IEZnJqgNk3jb4qiF5EjUPvtdBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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