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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b58ac14812564114200199b7b949df6c2fa2fe64bac7175816bfb5d410966568' 
  AND token = 'xfe3FxkUODXJe4bRYbUXvj+4mPg4YWhEEEYR8R8fiIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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