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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4a32558739a3d7205b0a6be253c771642d563449d4bf0547b2eb99ff2baa3765' 
  AND token = 'D+BjFp9OZfU6Y5bn3WmaNcwFoOWNA/oaRQy6Q27mxsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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