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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6e6984a4f9c11004266aeb8d43368ce1a54b8b4a15b4e9ac7dbea17325c5247a' 
  AND token = 'IDyG7xJ72MCEVgrAkmQMxIrQertWB0hJ79DlmNBJjIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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