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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '860b6ec1493e7afb738fa967d95ee83d3058e3fbf2269d5d707c44cd352ee66d' 
  AND token = '+PZhQF895jmRuQbTSB8gS2fbJNqFn87pHSOHvj7IA5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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