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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7d11fd060f26207663e8aef6ec8ad7e1aac35040f704ce103ca90b77ba1f0ad5' 
  AND token = 'G41B/TjAxMraggKpfR5huah4IN/tVRYllI02xHYY2dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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