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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bdc1265e36881082c2936fc52d700708421734c5005277be3b9aaad18ab01af8' 
  AND token = 'b9rZ4oE4t7n9RCeMVdcQoLKyvF6EDa2yhn7vNzMe+XU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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