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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1a8520f6b20beb7ad950d24e00014a9b3d388aca71c88c77a60d80d63a19e2f9' 
  AND token = 'k926eigtvw3Nwc5yq6cK3V5mLnFY2DAltlAylQ4E8U0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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