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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'facb8a8a14ffadc87532eee1104be2ef5853aeb8e37340d9a6cc4f87ea1ad381' 
  AND token = 'PGXlq5JDlNv4Q8aVf+T3bAnCFHl8OACeOYmXw01CR+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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