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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c81f7bb30113633181ee86983494f4519137c6c93efeaec26f609fbc93f24317' 
  AND token = 'LiI4OB6U9ZW3EEexLGN96pGJtorJNHb6csMrK8vmMWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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