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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5a785e4faba37f2f27682a5b49dfd47a1272f1aefc9a8ab2d8d2f23e5af8f1e3' 
  AND token = 'Oxn7PGBxrs3QVwRgjRCfVwq/ZhNcWPX43TO0NuhMyhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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