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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '45ba68cd66b359bf95ca8183ca3386fe51dc1c87ac7c828575c8304cf166adcd' 
  AND token = 'bunVdiV3Y2WohDMTLCxSYLbgnbi47B9ApUqa+oBZ8+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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