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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7b1382c894f735bd6859ea02a3ef2edabf82e725d6786f93b9fd3cd9a303f0c3' 
  AND token = 'oqMOKBD3O7SfcVQ86Pi9ZPuE2I+V9i/Jk+5kgB0LDOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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