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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8e044472f54c17e78a774d85dc7c6e33b8edb7e368810bff5c1c713fb7e95a71' 
  AND token = 'reoiepndm3TI8HvvUSrejVPvhjQ/6/5v8dTaa/ZpWRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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